blob: 4e816879c6a1e72faf706f1779599432047a7151 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2022 Sumit Garg <sumit.garg@linaro.org>
*
* Based on Linux driver
*/
#include <common.h>
#include <dm.h>
#include <generic-phy.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <reset.h>
#include <clk.h>
#include <linux/delay.h>
#define PHY_CTRL0 0x6C
#define PHY_CTRL1 0x70
#define PHY_CTRL2 0x74
#define PHY_CTRL4 0x7C
/* PHY_CTRL bits */
#define REF_PHY_EN BIT(0)
#define LANE0_PWR_ON BIT(2)
#define SWI_PCS_CLK_SEL BIT(4)
#define TST_PWR_DOWN BIT(4)
#define PHY_RESET BIT(7)
struct ssphy_priv {
void __iomem *base;
struct clk_bulk clks;
struct reset_ctl com_rst;
struct reset_ctl phy_rst;
};
static inline void ssphy_updatel(void __iomem *addr, u32 mask, u32 val)
{
writel((readl(addr) & ~mask) | val, addr);
}
static int ssphy_do_reset(struct ssphy_priv *priv)
{
int ret;
ret = reset_assert(&priv->com_rst);
if (ret)
return ret;
ret = reset_assert(&priv->phy_rst);
if (ret)
return ret;
udelay(10);
ret = reset_deassert(&priv->com_rst);
if (ret)
return ret;
ret = reset_deassert(&priv->phy_rst);
if (ret)
return ret;
return 0;
}
static int ssphy_power_on(struct phy *phy)
{
struct ssphy_priv *priv = dev_get_priv(phy->dev);
int ret;
ret = ssphy_do_reset(priv);
if (ret)
return ret;
writeb(SWI_PCS_CLK_SEL, priv->base + PHY_CTRL0);
ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, LANE0_PWR_ON);
ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, REF_PHY_EN);
ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, 0);
return 0;
}
static int ssphy_power_off(struct phy *phy)
{
struct ssphy_priv *priv = dev_get_priv(phy->dev);
ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, 0);
ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, 0);
ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, TST_PWR_DOWN);
return 0;
}
static int ssphy_clk_init(struct udevice *dev, struct ssphy_priv *priv)
{
int ret;
ret = clk_get_bulk(dev, &priv->clks);
if (ret == -ENOSYS || ret == -ENOENT)
return 0;
if (ret)
return ret;
ret = clk_enable_bulk(&priv->clks);
if (ret) {
clk_release_bulk(&priv->clks);
return ret;
}
return 0;
}
static int ssphy_probe(struct udevice *dev)
{
struct ssphy_priv *priv = dev_get_priv(dev);
int ret;
priv->base = (void *)dev_read_addr(dev);
if ((ulong)priv->base == FDT_ADDR_T_NONE)
return -EINVAL;
ret = ssphy_clk_init(dev, priv);
if (ret)
return ret;
ret = reset_get_by_name(dev, "com", &priv->com_rst);
if (ret)
return ret;
ret = reset_get_by_name(dev, "phy", &priv->phy_rst);
if (ret)
return ret;
return 0;
}
static struct phy_ops ssphy_ops = {
.power_on = ssphy_power_on,
.power_off = ssphy_power_off,
};
static const struct udevice_id ssphy_ids[] = {
{ .compatible = "qcom,usb-ss-28nm-phy" },
{ }
};
U_BOOT_DRIVER(qcom_usb_ss) = {
.name = "qcom-usb-ss",
.id = UCLASS_PHY,
.of_match = ssphy_ids,
.ops = &ssphy_ops,
.probe = ssphy_probe,
.priv_auto = sizeof(struct ssphy_priv),
};